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1983～1934年在贺兰山东麓淡灰钙土地区的区农垦科研所、前进农场、玉泉营农场、贺兰山农牧场,进行了大豆氮素化肥不同追肥期的试验,该地区开垦历史短,土壤熟化度低、理化性质差,质地为粉沙土,漏水漏肥,地力贫瘠,有机质含量0.5％左右,全氮0.05％、全磷0.08％、水解氮25.7ppm;速效磷18.9ppm,pH值8～8.5。大豆品种为铁丰18号。氮素化肥为辽河尿素(含纯N46％)。
From 1983 to 1934, the experiment of soybean topdressing fertilizer with different top-dressing stages was carried out in the area of Agricultural Reclamation Research Institute, Qianjin Farm, Yuquanying Farm and Helanshan Farm Ranch in the light gray soil area at the eastern foot of Helan Mountain. Low soil ripeness, poor physical and chemical properties, the texture of silt sand, leaking water leakage, poor fertility, organic matter content of about 0.5%, 0.05% of total nitrogen, 0.08% of total phosphorus, 25.7ppm of hydrolyzed nitrogen; available phosphorus 18.9ppm, pH 8 ~ 8.5. Soybean varieties for Iron Fung No. 18. Nitrogen fertilizer is Liaohe urea (including pure N46%).